'Head in a bag' victim's family don't know

Two days after West Australian police established the identity of a man whose head was found stuffed in a plastic bag on a beach at Rottnest Island, they still have not been able to contact his family.

Detectives said on Friday that the man was from Perth, but would not reveal any more details until his family was located and advised.

Police said on Sunday that they had no further updates as the Major Crime Squad continued its investigation.

"The man's next of kin has still not been notified, therefore, his name will not be released," a spokeswoman said.

The human head was found by a holidaymaker on the beach at Porpoise Bay, on the south-east side of the island on January 6.

An 11-year-old girl is believed to have made the horrific discovery when she opened the plastic bag and saw a human ear.

Police later confirmed the head belonged to a Caucasian male, possibly aged between 30 and 60.

Seven of the man's upper front teeth were missing - and had been for some time - but the man did not wear a plate or dentures, forensics have revealed.

His other teeth were also in a poor condition.

Forensic officers have searched several locations since identifying the man, including an apartment in East Perth where the he is believed to have lived.

The matter is being treated as a homicide and anyone with information is asked to call Crime Stoppers on 1800 333 000.